Acid-stabilized calcium carbonate, process for its production and method for its use in the manufacture of acidic paper

  • US 5,043,017 A
  • Filed: 03/09/1990
  • Issued: 08/27/1991
  • Est. Priority Date: 03/09/1990
  • Status: Expired due to Term
First Claim
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1. An acid-stabilized finely divided calcium carbonate comprising a mixture of at least about 0.1 weight percent of a compound selected from the group consisting of a calcium-chelating agent and a conjugate base, together with at least about 0.1 weight percent of weak acid, with the balance to give 100 weight percent being finely divided calcium carbonate, such that the calcium carbonate is coated by and is in equilibrum with the calcium-chelating agent or conjugate base and the weak acid.

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